将PHP二维数组提取出自己想要的信息

Question

原二维数组，信息很多
array(size=16)
'id'=>string'64'(length=2)
'user_id'=>string'64'(length=2)
'doc_id'=>string'121'(length=3)
'time'=>string'2015-08-0711:41:28'(length=19)
'email'=>string'[e-mail]'(length=17)
'username'=>string'孙策'(length=6)
'password'=>string'18bc4215375cd9773a5f572934018bfa'(length=32)
'phone'=>string'456181687'(length=9)
'category'=>string'2'(length=1)
'company'=>string'东吴集团'(length=12)
'name'=>string'孙策'(length=6)
'position'=>string'我被社长干死了'(length=21)
'address'=>string'建康'(length=6)
'state'=>string'3'(length=1)
'other_field'=>null
'authentication'=>string'1'(length=1)
array(size=16)
'id'=>string'65'(length=2)
'user_id'=>string'65'(length=2)
'doc_id'=>string'121'(length=3)
'time'=>string'2015-08-1104:27:08'(length=19)
'email'=>string'[e-mail]'(length=17)
'username'=>string'刘封'(length=6)
'password'=>string'18bc4215375cd9773a5f572934018bfa'(length=32)
'phone'=>string''(length=0)
'category'=>string'0'(length=1)
'company'=>string'蜀汉'(length=6)
'name'=>string'刘封'(length=6)
'position'=>string'备胎'(length=6)
'address'=>string'荆州阿萨斯'(length=15)
'state'=>string'2'(length=1)
'other_field'=>null
'authentication'=>string'1'(length=1)
现在只需要email，company，name，phone这四个值，怎么操作？
array(size=16)
'email'=>string'[e-mail]'(length=17)
'phone'=>string'456181687'(length=9)
'company'=>string'东吴集团'(length=12)
'name'=>string'孙策'(length=6)
array(size=16)
'email'=>string'[e-mail]'(length=17)
'phone'=>string''(length=0)
'company'=>string'蜀汉'(length=6)
'name'=>string'刘封'(length=6)

Answer 1

$keys=array(email，company，name，phone);foreach下原数组，if（！in_array($key,$keys)）,unset掉

Answer 2

$result=array_map(function($value){return['email'=>$value['email'],'company'=>$value['company'],'name'=>$value['name'],'phone'=>$value['phone']];},$arr);var_dump($result);